# Extruding a STL or ? file

**URL:** https://discourse.shapr3d.com/t/extruding-a-stl-or-file/19394
**Category:** Modeling Questions
**Created:** [May 16, 2022, 4:01pm UTC](https://discourse.shapr3d.com/t/extruding-a-stl-or-file/19394 "2022-05-16T16:01:47Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Cpat39](https://avatars.discourse-cdn.com/v4/letter/c/e47774/32.png) [@Cpat39](https://discourse.shapr3d.com/u/Cpat39)
#### Post date: [May 16, 2022, 4:01pm UTC](https://discourse.shapr3d.com/t/extruding-a-stl-or-file/19394/1 "2022-05-16T16:01:47Z")

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I’d like to extrude a file of QR code that is in PNG file format. Is there a file format I can convert the png file to that can then be extruded in Shapr3d?

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### Author: ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)
#### Post date: [May 16, 2022, 4:39pm UTC](https://discourse.shapr3d.com/t/extruding-a-stl-or-file/19394/2 "2022-05-16T16:39:24Z")

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I made a lithophane that I 3D printed after uploading a photo and got an STL file in return. This might work for you. It’s free to use.

[https://3dp.rocks/lithophane/](https://3dp.rocks/lithophane/)